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People jog along the Sydney Harbour with the Sydney Harbour bridge seen in the background on September 10, 2012. The iconic landmark is one of the top attractions in Sydney. AFP PHOTO/ROMEO GACAD (Photo credit should read ROMEO GACAD/AFP/GettyImages)
People jog along the Sydney Harbour with the Sydney Harbour bridge seen in the background on September 10, 2012. The iconic landmark is one of the top attractions in Sydney. AFP PHOTO/ROMEO GACAD (Photo credit should read ROMEO GACAD/AFP/GettyImages)

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    Running's last frontier: A sub 2 hour marathon

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Running's last frontier: A sub 2 hour marathon

Dr. Sanjay Gupta explains the history of running records and the ambitious bid to run the marathon in under two hours.

Running's last frontier: A sub 2 hour marathon

Dr. Sanjay Gupta explains the history of running records and the ambitious bid to run the marathon in under two hours.